BRATTLEBORO - An aggravated murder charge against John Grega, a Long Island, N.Y., man charged with killing his wife in 1995, has been dismissed, because of difficulties with additional DNA testing.

The dismissal of the second murder charge against Grega comes a year after his 1996 conviction was dismissed, and a new trial ordered, because of new DNA evidence.

Windham County State's Attorney Tracy Shriver announced late Wednesday that murder charges against Grega would be dismissed without prejudice because of difficulties finding a lab to do necessary DNA matching of evidence taken from Christine Grega's body.

Shriver, in a joint statement with Vermont Assistant Attorney General Cindy Maguire, said they "remain committed to continuing this investigation to seek justice for Christine Grega and her family."

In 2012, new DNA testing had revealed the presence of an unknown man's DNA in her body, the discovery of which resulted in a judge ordering a new trial.

Grega's case was one of the first to be renewed under Vermont's Innocence Project, which allowed for DNA testing in old cases. During Grega's original 1996 trial, DNA testing was not used routinely in criminal cases in Vermont.